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' 0 On October 2, 2002, ASE personnel discovered that the C-Sparger • master relay had failed several days prior On October 3, 2002, a new ' master relay was installed and the system was restarted • In early December 2002, ASE noticed that the pressure of the injected ' air had dropped off slightly in each of the ozone-sparging wells ASE replaced the piston inside the air compressor, which had shown ' excessive wear on the piston's gasket In early January 2003, ASE discovered that the solenoids for ozone- 1 sparging wells 5 and 6 were malfunctioning in a constant OPEN position ASE replaced the two solenoids ASE also began noting a slight ozone odor around the C-Sparger in late January On February 12, 2003, McCulloch Environmental personnel were summoned to the site to evaluate the system and its components McCulloch noted that ' all of the pressures appeared well below normal, and that air appeared to be escaping from the tubing manifold gust below ground, beneath the C-Sparger unit ' • On February 14, 2003, ASE personnel arrived at the site, removed the concrete covering the tubing manifold gust beneath the C-Sparger, a n d ' discovered that the tubing from S of the 10 ozone sparging wells h a d become cracked, kinked or broken dust below the surface of the ' concrete ASE repaired the tubing, wrapped the tubing with pipe insulation, and placed it within a smooth-turn secondary containment pipe The tubing failure appeared to be the result of the system's constant vibration and the tubing rubbing against a sharp portion of the secondary containment piping that was installed in August 2002 ' 3 . 0 DISSOLVED OXYGEN READINGS Each week, ASE visits the site to check on the performance of the system, to make necessary repairs, and to measure the DO in the six groundwater monitoring wells The DO readings are tabulated in Table One ' 4 . 0 GROUNDWATER SAMPLING EVENTS ' Since turning the remediation system on, the six groundwater monitoring wells have been sampled 5 times The analytical results are tabulated in Table Two Graphs showing the TPH-G, BT'EX, MTBE, TAME, and TBA ' concentrations in each of the monitoring wells since April 2002 are in t h e Graphs Section of this report April 2002 was chosen as the starting point ' because it shows two sampling events prior to the system being turned on Singh's Unocal System First six Month's Operation Report — February 2003 ' -2-